Improvement in balanced slide-valves



UNITED STATES PATENT OFFICE.

VIRGIL D. GREEN, OF WATERTOWN, WISCONSIN.

IMPROVEMENT IN BALANCED SLIDE-VALVES.

Specification forming part of Letters Patent No. 52,286, dated January30, 1866.

To all whom it may concern:

Be it known that I, VIRGIL D. GREEN, of Vatertown, in the county ot'Jefferson and State of Wisconsin, have invented a certain new and usefulImprovement on Valves for' Steam-Engines; and I do hereby declare thatthe following is a full, clear, and exact description of the same,reference being had to the accompanying drawings, and to the letters andmarks thereon.

As is shown by the drawings forming part of this specification, myimprovement relates to the balanced D-valvc, said drawings representin gmy invention, Figure l being a perspective view thereof, Fig. 2 being alongitudinal, and Fig. a transverse sectional, view ofthe same, in eachof the iigures like marks and letters being used to indicate like part-swhen shown.

A indicates a hollow valve with eductionports W W, and F F steam-pipesworking through stuffing-boxes d d and glands U U, the pipes being forthe purpose of conveying the steam to theA valves.

G is a balance -plug passing through the top of the valve, and madesteam-tight by means of stuffing-boxes d d and cap or gland M M, andheld in place by set-screw J, or its equivalent, through the medium ofsector B.

The area of the steam-plug G is in excess of the area ofthe steam-portsW W sutticient to balance the pressure of steam from the cylinder and tohold the valve to its seat and prevent its lifting.

K is abridge to the valve, which may be at tached or detached as thedifferent engines may require.

It E are brackets locked and bolted to the inside of the valve, as shownin Fig. 3 of the drawings, for bridge K to rest on when the valve isused for reversing engines-for instance, in locomotives, when it isnecessary to reverse the engine under a high rate of speed. The dottedline in Fig. 2 above the bridge represents the bridge raised oft' thebracket R at one end, which will relieve the steam in the cylinder. Thedotted line E in Fig. 2 indicates a side view of the bracket, beingshorter at the top for allowing the bridge to rise without binding.

Q is a spring between bridge K andv balance-plug Gr, to keep thebalance-plug against sector B when the steam is shut oft' and the engineis yet in motion.

I P indicate valve-seat; o o, steam-ports; L. the exhaust-port. Thevalve is represented as standing on the center with the ports closed.

H H is a steam-yoke bolted to valve-seat or cylinder. C U aresteam-passages through the steam-yoke to steam-pipes F F, as indicatedby arrows. C in Fig. 3 represents the junction of the steam-passagesthrough the yoke.

I is a flange for the attachment ofthe steampipe.

N is a knuckle -joint for the valve rod connection; E, valve-stemsworking through boxes S, as shown in Fig. 1.

T is a box for the sector to work in, the bearing in the box beingelongated, as shown by the dotted lines in Fig. 2, there being nosliding surface to need lubricating, as the sector rolls at the top andon the balance-plug G.

Instead of the pipes F F being used as recited and shown by thedrawings, they may be attached to the yoke and work throughstuffing-boxes in the valve, or be attached to the steam-plug by makingthe plug hollow.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The hollow D-valve provided with ports for conveying steam to thecylinder, and having steam-pipes F Fattached to it, subst-antially asset forth. I

2. The balance-plug G, in connection with the valve I), for the purposeof balancing th valve, as herein described.

3. The valve or balance-plug G, in combination with the setscrew J,sector B, and spring Q, or their equivalents, for adjusting the plug, asherein set forth.

4. The arrangement of the brackets It It and bridge K, detached from thevalve, for the purpose of adapting the valve to and relievin g the steamin the cylinder in reversing engines, and allowing the use of the valvein non-reversing engines.

5. The steam-pipes F F, arranged and operated substantially as setforth.

This specification signed this 15th day of September, 1865.

VIRGIL D. GREEN. Witnesses:

J. A. HALL, CEAS. H. WILBER.

